It's not an experiment though. The divide is clear, you have a client application, and then server applications that the client talks to. This is even more true if you want a lot of interactivity. This line isn't going away anytime soon. There will always be an application that runs on the edge device or machine, and it needs to talk to some other application to store and retrieve data.
It just depends on the use case. The "interface" could be complicated enough that it needs a full blown application with state. I would say that's the typical expectation today from users.
